JP3918919B2 - Image forming apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming apparatus that corrects image data so as to cancel deformation that occurs when an image is formed on a sheet and forms an image, and a method thereof.
[0002]
[Prior art]
Improvements in frequent output of high-speed and high-quality color printers in recent years have been developed to a level comparable to plate printing.
In addition, along with the digitization of information, digital printing machines that realize on-demand printing have appeared, and the demand in the printing market for color printers is increasing.
Such a printer is required to have a high level of registration (registration) performance.
However, printers that have been developed mainly in offices are not good at high-accuracy alignment due to changes in image magnification due to paper deformation, changes in registration amount, etc., due to image forming methods.
[0003]
In order to make up for such a point, Japanese Patent Laid-Open No. 4-288560 and Japanese Patent Laid-Open No. 3-132673 can be cited as documents that disclose a method of performing alignment by correcting the magnification of both surfaces.
Further, as a document disclosing a method for correcting the position of a sheet, there can be cited JP-A-4-249169 and JP-A-3-46946.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the prior art, and an image forming apparatus and method for enabling high-precision registration (registration) of images in a high-speed, high-quality color printer or the like. The purpose is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a first image forming apparatus according to the present invention includes an image forming unit that forms an image from image data, an image reading unit that reads an image formed from the image data, and the read Detection means for detecting deformation of the formed image based on the image and the image indicated by the image data, and image correction means for correcting the image data based on the detection result of the deformation.
[0006]
Preferably, deformations that may occur when an image is formed from the image data include skew, arcuate, magnification change and register deformation or one or more of these deformations, the sensing means comprising: The skew, the bow, the magnification change, the deformation of the register, or a deformation including one or more of these deformations is detected, and the image correction unit corrects the image data based on the detection result of the deformation.
[0007]
Preferably, the image forming unit forms an image from image data on a sheet and fixes the image, and the image reading unit reads an image formed and fixed on the sheet.
[0008]
Further, the second image forming apparatus according to the present invention includes an image forming unit that forms an image on each of a plurality of surfaces from image data, an image reading unit that reads an image formed on each of the plurality of surfaces, and the reading Image correction means for correcting the image data so as to match the received images.
[0009]
Preferably, the image forming unit forms images on both sides of the sheet from image data, the image reading unit reads images formed on both sides of the sheet, and the image correcting unit includes both sides of the sheet. The image data is corrected so as to cancel the difference between the images read from.
[0010]
A first image forming method according to the present invention is an image forming method for forming an image from image data, wherein the image formed from the image data is read, and the read image and the image data are The deformation of the formed image is detected based on the displayed image, and the image data is corrected based on the detection result of the deformation.
[0011]
The second image forming method according to the present invention is an image forming method for forming an image on each of a plurality of surfaces from image data, wherein the images formed on each of the plurality of surfaces are read and read. The image data is corrected so as to match the images.
[0012]
A first program according to the present invention is a program for forming an image from image data, the step of reading an image formed from the image data, the read image, and an image indicated by the image data And a step of detecting deformation of the formed image and a step of correcting the image data based on the detection result of the deformation.
[0013]
Further, a second program according to the present invention is a program for forming an image on each of a plurality of surfaces from image data, the step of reading the images formed on each of the plurality of surfaces, And a step of correcting the image data so as to match.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
[Background of the invention]
FIG. 1 is a diagram illustrating the deformation of a sheet that occurs when an image is fixed.
As described above, high-speed and high-quality color printers are required to have high-precision alignment performance (registering).
However, as shown in FIG. 1, in a printer / copy machine or the like that fixes toner to paper, moisture is evaporated due to the influence of heat when the image is fixed on paper, and the paper shrinks. The paper stretches due to processing pressure.
When the shape of the paper changes in this way, the shape of the image formed on the paper also changes even when printing is performed only on one side of the paper without performing double-sided printing.
[0015]
FIG. 2 is a diagram illustrating skew deviation and registration deviation.
If there is skew and registration misalignment as shown in Fig. 2, if you try to perform double-sided printing using the reversal mechanism, the top and bottom of the paper will be reversed, and skew misalignment on the front and back and registration misalignment with paper cutting error will occur. May appear greatly.
When performing double-sided printing, the shape of the image cannot be matched on both sides of the paper due to such problems.
For example, even if an attempt is made to print a lattice pattern (register mark) at the same position on both sides of the paper, the positions of the front and back surfaces and the output lattice pattern will not match.
[0016]
FIG. 3 is a diagram illustrating rotation and skew that occur when printing is performed using an intermediate transfer member.
When printing using an intermediate transfer member, as shown in FIG. 3, due to the difference in the nip balance in the axial direction of the transfer portion, there is a difference between the image transfer direction and the paper traveling direction. May occur and rotation and skew may occur.
When such skew and rotation occur, there is a problem that the image printed on the paper becomes trapezoidal or fan-shaped.
[0017]
Up to now, the deviation in the main scanning direction has been changed by changing the video clock cycle and the writing position, and the deviation in the sub-scanning direction has been changed by the rotation speed of the polygon mirror, and image formation and paper The image has been enlarged / reduced by utilizing the speed difference between the two and the like, and a device has been devised to compensate for the difference in image magnification between both sides of the paper.
However, when changing the main and sub magnifications at once, enlargement / reduction in the main scanning direction can be realized instantaneously by changing the clock cycle, etc., but enlargement / reduction in the sub-scanning direction can be done by changing the rotation speed of the motor. Since there is a delay, it is difficult to realize it instantaneously.
[0018]
On the other hand, in order to correct the registration error, a method of adjusting the timing of printing an image on a sheet or the timing of feeding a sheet is adopted.
However, even if such adjustment is performed, deformation such as skew, rotation, trapezoid, and fan shape cannot be corrected.
[0019]
Therefore, as shown in FIG. 4, when an image is deformed in a state where these deformations are combined in combination on both sides of double-sided printing, in order to correct the deformation such as skew and trapezoid, Although a mechanism is required, even if such a mechanism is provided, it is difficult to completely correct complex deformation.
Moreover, the addition of such a mechanism increases the scale of the apparatus and its cost.
[0020]
Further, when trying to cope with the above-mentioned problems by mechanical means, adjustments are required to adapt the apparatus to the change whenever the size / type of paper or the environment changes.
In addition, for example, when a defect with a different tendency occurs depending on the print surface, in order to perform double-sided printing by changing the print surface between the front and back sides, each time the print surface changes, the defect is corrected. The mechanism must also be replaced.
Thus, when both sides of a sheet are printed alternately, it is difficult to adopt a method for correcting a defect by mechanical means.
The present invention has been made paying attention to such facts, and is devised to correct the deformation generated in the image regardless of mechanical means, and to match the image on both sides of the paper when performing duplex printing. ing.
[0021]
[Deformation and correction]
As an outline of the present invention, first, the deformation that the image undergoes and its correction will be described.
FIG. 5 is a diagram illustrating image formation by a general printer.
FIG. 6 is a diagram showing image formation to which the first image forming method according to the present invention is applied.
FIG. 7 is a first diagram showing image formation to which the second image forming method according to the present invention is applied.
If an image is printed (formed) on a sheet without taking any countermeasures against deformation, the resulting output image may be deformed as described with reference to FIGS.
When performing double-sided printing, the shape of the image may not match on both sides of the paper due to deformation that occurs during printing.
[0022]
On the other hand, as shown in FIG. 6, it is measured how the image undergoes deformation during printing, and the deformation received during printing is canceled (cancelled) with respect to the original image data. If this corrected image data is printed as corrected image data after performing shape data correction processing, a correct output image can be obtained.
Also, when performing duplex printing, the deformation that occurs in the image when printing on one side (front side) of the paper is different from the deformation that occurs in the image when printing on the other side (back side) of the paper. There is.
[0023]
In such a case, different deformations are measured separately on the front and back sides of the paper, and for images printed on the front surface, correction is performed to cancel the deformation that occurs when the front surface is printed. If the image printed on the back side and the image printed on the back side is corrected as the back side corrected image data after correcting the deformation that occurs when printing on the front side, the shape of the images on the front and back sides of the paper may be matched. it can.
It should be noted that neither the front or back image is matched with the other, nor correction for canceling the deformation of both the front and back images, but the average value of the deformation that the front and back images undergo, for example, is obtained, and the average value of this deformation is calculated. Even if correction for canceling is performed on each of the image data printed on the front and back surfaces, the shape of the output image can be made to match on the front and back surfaces of the paper (see FIG. 7).
[0024]
FIG. 8 is a second diagram showing image formation to which the second image forming method according to the present invention is applied.
Further, in the method shown in FIG. 8, in order to match the shape of the front and back images of the paper, the original screen data without correction is printed on the front surface, and the output image remains deformed.
On the other hand, for data to be printed on the back side, after printing, it is corrected so as to receive the same deformation as the image data printed on the front side to obtain back side correction data, and when this back side correction data is printed, Try to undergo the same deformation.
As shown in FIG. 8, the shape of the front and back images can be matched in the double-side printing by correcting either the front or back image data.
[0025]
FIG. 9 is a diagram illustrating a method for correcting a part of image data.
As shown in FIG. 9, some deformation may occur during printing.
In such a case, the deformation of the output image can be canceled by printing the image data with correction only applied to the deformed portion.
[0026]
[Correction method]
Next, the correction method will be specifically described.
In the following description of the correction method, a specific example is 2400 × 2400 DPI (dot interval 0.0106 mm).
[0027]
[Registration correction]
FIG. 10 is a diagram illustrating an example of correction processing for registration adjustment in the main scanning direction and the sub-scanning direction.
FIG. 11 is a diagram showing a specific example of the correction shown in FIG.
As shown on the left side of FIG. 10, for example, when the side registration (side registration) of 8.5 mm on the right side of the original image is printed with an actual output image of 8.6 mm, shifted to the left by 0.1 mm. think of.
In such a case, as shown on the right side of FIG. 10, the input image data may be corrected by moving it to the right by 0.1 mm in advance by the shape data correction process and then printed.
[0028]
That is, if the right side register of the input image data is set to 8.4 mm and then printed, the printing is moved 0.1 mm to the left side to make the side register 8.5 mm, and an output image of the same side register as the original image can be obtained.
As described above, in order to cancel the registration deviation in the main scanning direction and the sub-scanning direction in the output image, a correction is performed in advance by moving the input image by the same length in the opposite direction to the deviation occurring in the output image. Just do it.
[0029]
Further, side register correction will be described in detail.
Correction for moving the input image to the right by 0.1 mm is performed as follows.
As shown on the left side of FIG. 11, white pixels are inserted in an area within 0.1 mm from the left end of the input image.
Further, as shown on the left side, the center, and the right side of FIG. 11, the pixels in other regions are moved to the right by 0.1 mm.
In addition, as shown on the right side of FIG. 11, pixels in an area within 0.1 mm from the right edge of the input image, that is, pixels in an area that protrudes from the drawing area when moved 0.1 mm to the right are thinned out (ignored). )
[0030]
[Lead skew correction]
FIG. 12 is a diagram illustrating a correction process for lead skew adjustment.
FIG. 13 is a diagram showing a specific example of the correction shown in FIG.
As shown on the left side of FIG. 12, when lead skew occurs in the output image, as shown on the right side of FIG. 12, the same amount of lead skew is applied to the input image in the direction opposite to the lead skew in the output image. May be corrected so as to give
[0031]
The left side of FIG. 12 shows two examples of correction processing. On the left side of these examples, as shown with an arrow, the left side of the output image is shifted upward, and the right side The correction performed when is shifted downward is shown.
In addition, the right side of these examples shows correction performed when the left end of the output image is not shifted and is shifted downward as going to the right, as indicated by an arrow.
As shown in FIG. 13, the correction of the lead skew is also performed by moving, inserting, and thinning pixels, as in the case of the registration adjustment shown in FIG.
[0032]
[Side skew correction]
FIG. 14 is a diagram illustrating a correction process for side skew adjustment.
FIG. 15 is a diagram showing a specific example of the correction shown in FIG.
As shown on the left side of FIG. 14, when side skew occurs in the output image, as shown on the right side of FIG. What is necessary is just to correct | amend so that the same amount of side skew may be given in the direction opposite to side skew.
[0033]
Note that, on the left side of FIG. 14, as in the case of the lead skew adjustment shown in FIG. 12, two examples of correction processing are shown, but the left side of these examples is indicated by an arrow. The correction performed when the upper side of the output image is shifted to the right and the lower side is shifted to the left is shown.
Further, the right side of these examples shows correction performed when the upper end of the output image does not shift and shifts to the left as it goes down, as indicated by an arrow.
As shown in FIG. 15, side skew correction is also performed by moving, inserting, and thinning pixels, as in the case of registration adjustment and lead skew adjustment shown in FIGS.
[0034]
[Magnification correction]
FIG. 16 is a diagram illustrating a correction process for adjusting the magnification.
FIG. 17 is a diagram showing a specific example of the correction shown in FIG.
FIG. 18 is a diagram illustrating correction of a multicolor image.
As shown on the left side of FIG. 16, the printing paper may be long in the vertical direction and deformed in the horizontal direction due to heat or the like, and the output image may be similarly deformed to change its magnification.
In such a case, as shown on the right side of FIG. 16, the magnification is adjusted so as to cancel the change that occurs in the output image with respect to the input image, that is, to shorten the vertical direction and lengthen the horizontal direction. Correction may be performed.
[0035]
The magnification is corrected by adding a pixel to one end of the input image as shown at the top of FIG. 17 or as appropriate in the input image as shown second from the top in FIG. This is done by inserting pixels at intervals.
Furthermore, this correction can also be performed by adding pixels to both ends of the image as shown in the third and fourth from the top in FIG.
Furthermore, when the image is multicolored, if pixels are inserted in the same manner for each color, the image is disturbed due to the insertion of the pixels, resulting in poor appearance.
Therefore, in such a case, as shown in FIG. 18, it is preferable to insert pixels into the input image in a manner different in color.
[0036]
[Correct bow]
FIG. 19 is a diagram illustrating a correction process for adjusting the bow.
FIG. 20 is a diagram showing a specific example of the correction shown in FIG.
As shown on the left side of FIG. 19, the printing paper is deformed by heat or the like, and accordingly, the output image may be subjected to an arcuate distortion in which the central portion is shrunk in the vertical direction.
In such a case, as shown on the right side of FIG. 20, the input image may be corrected so as to cancel the change that occurs in the output image, that is, so that the central portion is convex.
As shown in FIG. 20, this correction is performed by moving, inserting and thinning pixels.
[0037]
[Partial correction of image]
FIG. 21 is a diagram illustrating a correction process for adjusting a part of an image.
FIG. 22 is a diagram showing the correction shown in FIG.
As shown on the left side of FIG. 21, only a part of the output image may be deformed due to a paper feed defect or the like.
In such a case, as shown on the right side of FIG. 21, it is only necessary to perform a correction for deforming the input image so as to cancel the change occurring in the output image.
As shown in FIG. 22, this correction is performed by approximating the pixel movement amount with a broken line even if correction is performed so that the movement amount of each pixel changes smoothly for the portion to be corrected in the input screen. Or a combination of these corrections may be given.
[0038]
[Printer]
Hereinafter, as an embodiment of the present invention, a printer apparatus 1 that performs printing by performing the above-described shape data correction processing on an input image will be described.
FIG. 23 is a diagram showing the configuration of the printer apparatus 1 according to the present invention, centering on the control apparatus 10.
FIG. 24 is a diagram showing a schematic configuration of the apparatus main body 2 shown in FIG.
As shown in FIG. 23, the printer apparatus 1 includes a copy apparatus main body 2, a control apparatus 10 including a memory 100 and a CPU 102, a recording apparatus 14 such as a CD-ROM / HDD, a display apparatus / keyboard, and the like. The display / input device 16 is configured.
The control device 10 and the recording device 14 are actually housed inside the copy apparatus main body 2.
[0039]
As shown in FIG. 24, the copy apparatus main body 2 (FIG. 23) includes a sheet tray 200, a registration roller 202, a sheet conveyance path 204, an image transfer unit 22 including a photosensitive member 220 and an intermediate transfer member 222, a fixing device 24, and a scanner. 26 and a paper reversing device 28.
In other words, the printer apparatus 1 transfers an image of image data supplied from, for example, a network (not shown) or the like to the sheet 18 sent from the sheet tray 200 with toner, and the fixing apparatus 24. The image forming apparatus includes a constituent part as a general printer that performs image formation (printing) to be fixed by the scanner and a scanner 26 that reads an output image.
Each component of the copy apparatus main body 2 operates according to the control of the control apparatus 10 (FIG. 23).
In addition, the copying apparatus main body 2 may be of a type that prints directly on the paper 18 from the photosensitive member 220 without the intermediate transfer member 222, or may be of another type having a plurality of image transfer units 22. .
[0040]
[Print control program 4]
FIG. 25 is a diagram illustrating a configuration of the print control program 4 that performs shape data correction processing on an input image so as to cancel the deformation that the output image undergoes.
As shown in FIG. 25, the print control program 4 includes an image storage unit 400, an image correction unit 402, an image analysis unit 420, a correction data generation unit 422, and a print control unit 44.
The print control program 4 is supplied to the recording device 14 by, for example, the recording medium 140 (FIG. 23), loaded into the memory 100, and executed.
[0041]
The print control program 4 analyzes the change that occurs in the output image in the copy apparatus main body 2 (FIGS. 23 and 24) using these components, performs correction to cancel the change on the input image, and prints. To do.
Each component of the print control program 4 is configured as a program module, and can be added or deleted as appropriate.
Each component of the print control program 4 can be activated / executed or interrupted at any timing by the OS or the like as necessary.
[0042]
[Image storage unit 400]
The image storage unit 400 stores data of an input image that is input from a network (not shown) or the like, and is subject to IRECT processing (correction processing) and printing processing by the print control program 4. Output to the unit 420.
[0043]
[Image Analysis Unit 420]
The image analysis unit 420 uses the scanner 26 of the copying apparatus main body 2 (FIGS. 23 and 24) to test the test pattern printed on the paper 18 by the image transfer unit 22 (for example, the lattice pattern (register mark) shown in FIG. )) Output image is read.
Further, the image analysis unit 420 compares the read output image with the input image of the test pattern input from the image storage unit 400, and any of the modifications shown in FIGS. 10 to 22 is added to the output image. Or a combination of these is applied, and the analysis result is output to the correction data generation unit 422.
Note that, when the printer device 1 performs double-sided printing, the image analysis unit 420 generates separate analysis results for the front surface and the back surface.
[0044]
Alternatively, the image analysis unit 420 stores the type / shape of the paper 18 (FIG. 24) and the analysis result of deformation generated in the output image in association with each other, and is designated via the display / input device 16 or the like. Depending on the type and shape of the paper 18, an analysis result of deformation generated in the output image is output to the correction data generation unit 422.
When the image analysis unit 420 performs only such an operation, the scanner 26 (FIG. 24) is not necessarily required.
[0045]
[Correction data generation unit 422]
Based on the analysis result input from the image analysis unit 420, the correction data generation unit 422 indicates what correction should be performed on the input image in order to cancel the deformation that has occurred in the output image. Data is generated and output to the image correction unit 402.
In other words, the correction data generated by the correction data generation unit 422 is the output shown in FIG. 10, FIG. 12, FIG. 16, FIG. 19, FIG. 13, FIG. 15, FIG. 17, FIG. 18, FIG. 20, and FIG. 22, or a combination of these correction processes.
When the printer device 1 performs double-sided printing, the correction data generation unit 422 generates separate correction data for the front surface and the back surface.
[0046]
[Image Correction Unit 402]
The image correction unit 402 performs IRECT (correction processing) on the input image data according to the correction data input from the correction data generation unit 422 and outputs the corrected image data to the print control unit 44.
In addition, when the printer apparatus 1 performs double-sided printing, the image correction unit 402 corrects an input image printed on the front surface using correction data generated on the front surface and prints on the back surface. The input image to be corrected is corrected using the correction data generated for the back surface.
[0047]
[Print Control Unit 44]
The print control unit 44 controls each component (FIG. 24) of the copy apparatus main body 2 to print the corrected image data input from the image correction unit 402.
[0048]
[Operation of Printer 1 (1)]
Hereinafter, the first operation of the printer apparatus 1 in which the image analysis unit 420 receives the designation of the type and shape of the paper 18 and outputs the analysis result will be described.
FIG. 26 is a flowchart showing a first operation of the printer apparatus 1 (FIG. 23, etc.).
As shown in FIG. 26, in step 100 (S100), the image analysis unit 420 (FIG. 25) receives designation of the type and shape of the paper 18 (FIG. 24) via the display / input device 16.
[0049]
In step 102 (S102), the image analysis unit 420 outputs a change amount analysis result corresponding to the type and shape of the designated paper 18 to the correction data generation unit 422.
The correction data generation unit 422 generates correction data based on the analysis result input from the image analysis unit 420 and outputs the correction data to the image correction unit 402.
[0050]
In step 104 (S104), the print control program 4 starts actual printing (printing) on the paper 18.
[0051]
In step 106 (S106), the image correction unit 402 determines whether or not the input image is printed on the front surface. If the input image is printed on the front surface, the process proceeds to step S108. Proceeds to S110.
[0052]
In step 108 (S108), the image correction unit 402 corrects the input image data using the correction data for the surface to obtain corrected image data, which is output to the print control unit 44.
When the printer apparatus 1 performs single-sided printing on a plurality of sheets 18, only the process of S108 is executed.
[0053]
In step 110 (S110), the image correction unit 402 corrects the input image data using the correction data for the back surface to obtain corrected image data, and outputs the corrected image data to the print control unit 44.
[0054]
In step 112 (S112), the print control unit 44 controls each component of the copy apparatus main body 2 to print the corrected image data input from the image correction unit 402 on the paper 18.
[0055]
In step 114 (S114), the print control program 4 determines whether or not the output (printing) of the image has ended. If it has ended, the process ends. Otherwise, the process returns to S106. .
[0056]
[Operation of Printer 1 (2)]
Hereinafter, the second operation of the printer apparatus 1 in which the image analysis unit 420 analyzes the deformation of the output image using the output image read by the scanner 26 will be described.
FIG. 27 is a flowchart showing a second operation of the printer apparatus 1 (FIG. 23, etc.).
In FIG. 27, the same processes as those in the first operation (FIG. 26) are denoted by the same reference numerals.
[0057]
In step 120 (S120), the print control unit 44 performs double-sided printing and prints a test pattern on both sides of the paper 18 (trial printing).
[0058]
In step 122 (S122), the scanner 26 (FIG. 24) reads each image printed on both sides of the paper 18, and outputs it to the image analysis unit 420 (FIG. 25).
The image analysis unit 420 compares the output images on both sides of the paper 18 input from the scanner 26 with the input image of the test pattern input from the image storage unit 400, and is generated on each of the output images on both sides of the paper 18. The deformation is analyzed, and these analysis results are output to the image correction unit 402.
[0059]
In S <b> 102 to S <b> 114, the print control program 4 performs the processing indicated by the same reference numerals in FIG. 27 to print on the paper 18.
[0060]
Although the above description has been made on a copying machine with a built-in scanner, it goes without saying that the present invention is also applicable to a system in which an image read by an independent scanner device is read offline and printed by a printer. .
[0061]
【The invention's effect】
As described above, according to the image forming apparatus and the method of the present invention, it is possible to perform high-precision registration (registration) of images in a high-speed, high-quality color printer or the like.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating deformation of a sheet that occurs when an image is fixed.
FIG. 2 is a diagram illustrating skew deviation and registration deviation that occur when paper is reversed.
FIG. 3 is a diagram illustrating rotation and skew that occur when printing is performed using an intermediate transfer member;
FIG. 4 is a diagram illustrating image deformation when performing double-sided printing.
FIG. 5 is a diagram illustrating image formation by a general printer.
FIG. 6 is a diagram showing image formation to which the first image forming method according to the present invention is applied.
FIG. 7 is a first diagram illustrating image formation to which a second image forming method according to the present invention is applied.
FIG. 8 is a second view showing image formation to which the second image forming method according to the present invention is applied.
FIG. 9 is a diagram illustrating a method of correcting a part of image data.
FIG. 10 is a diagram illustrating an example of correction processing for registration adjustment in the main scanning direction and the sub-scanning direction.
11 is a diagram showing a specific example of the correction shown in FIG.
FIG. 12 is a diagram illustrating a correction process for lead skew adjustment.
13 is a diagram showing a specific example of the correction shown in FIG.
FIG. 14 is a diagram illustrating correction processing for side skew adjustment.
15 is a diagram showing a specific example of the correction shown in FIG.
FIG. 16 is a diagram illustrating a correction process for adjusting the magnification.
17 is a diagram showing a specific example of the correction shown in FIG.
FIG. 18 is a diagram illustrating correction of a multicolor image.
FIG. 19 is a diagram illustrating correction processing for adjusting a bow.
20 is a diagram showing a specific example of the correction shown in FIG.
FIG. 21 is a diagram illustrating a correction process for adjusting a part of an image.
22 is a diagram showing the correction shown in FIG. 21. FIG.
FIG. 23 is a diagram showing a configuration of a printer apparatus according to the present invention, centering on a control apparatus.
24 is a diagram showing a schematic configuration of the apparatus main body shown in FIG.
FIG. 25 is a diagram illustrating a configuration of a print control program 4 that performs shape data correction processing on an input image so as to cancel deformation that the output image undergoes.
FIG. 26 is a flowchart showing a first operation of the printer apparatus (FIG. 23, etc.).
FIG. 27 is a flowchart showing a second operation of the printer apparatus (FIG. 23, etc.).
[Explanation of symbols]
1 ... Control device
10 ... Control device
100 ... Memory
102 ... CPU
14 ... Recording device
140... Recording medium
16 ... Display / input device
18 ... paper
2 ... Copying machine body
200 ... Paper tray
202 ... Register roller
204: Paper transport path
22 ... Image transfer section
220 ... Photoconductor
222 ... Intermediate transfer member
24. Fixing device
26 ... Scanner
28 ... Paper reversing device
4. Print control program
400: Image storage unit
402: Image correction unit
420: Image analysis unit
422 ... Correction data generation unit
44... Print control unit

Claims (6)

Recording medium conveying means for conveying a recording medium having two recording surfaces;
Image forming means for forming an image on the recording surface of the transported recording medium from image data;
Image reading means for reading an image formed on the recording surface ;
Detecting means for detecting an inclination of the image formed on the recording surface with respect to the recording surface based on the read image and an image indicated by the image data;
Image correction means for generating correction data based on the detection result of the tilt , and correcting the image data based on the generated correction data ;
When an image is formed on the first recording surface and the second recording surface of the recording medium, an end portion of the recording medium that is transported first with respect to the transport direction of the transported recording medium is A recording medium reversing means for reversing the sheet so that the sheet is conveyed later with respect to the direction of conveyance.
With
When the image correction unit forms an image on the first recording surface, the image correction unit generates the image data based on correction data generated based on the detection result of the inclination of the image formed on the first recording surface. When the image is formed on the second recording surface, the image data is corrected based on the correction data generated based on the detection result of the inclination of the image formed on the second recording surface. Do
An image forming apparatus. The recording medium is an image recording paper,
The image forming means forms and fixes an image from image data on a recording surface of an image recording paper ,
The image forming apparatus according to claim 1 , wherein the image reading unit reads an image formed and fixed on a recording surface of the image recording sheet . The image correction unit generates the correction data so as to cancel the detected inclination based on the detection result of the inclination.
  The image forming apparatus according to claim 1. A program for forming an image from image data,
Conveying a recording medium having two recording surfaces;
From image data , forming an image on the recording surface of the transported recording medium ;
Reading an image formed on the recording surface ;
Detecting an inclination of the image formed on the recording surface with respect to the recording surface based on the read image and an image indicated by the image data;
Generating correction data based on the tilt detection result, correcting the image data based on the generated correction data ;
When an image is formed on the first recording surface and the second recording surface of the recording medium, an end portion of the recording medium that is transported first with respect to the transport direction of the transported recording medium is A step of reversing to be conveyed later with respect to the direction of conveyance;
Including
In the step of correcting the image, when the image is formed on the first recording surface, the correction data generated based on the detection result of the inclination of the image formed on the first recording surface is used. When the image data is corrected and the image is formed on the second recording surface, the image data is generated based on the correction data generated based on the detection result of the inclination of the image formed on the second recording surface. To correct
A program characterized by that .   The recording medium is an image recording paper,
  In the step of forming the image, the image is formed from the image data and fixed on the recording surface of the image recording paper,
  The step of reading the image reads the image formed and fixed on the recording surface of the image recording sheet.
  The program according to claim 4.   The step of correcting the image generates the correction data so as to cancel the detected inclination based on the detection result of the inclination.
  The program according to claim 4 or 5.

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